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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table provides a reconciliation of benefit obligations, plan assets and the funded status of the pension plans and other postretirement benefits:
Pension BenefitsOther
Postretirement Benefits
 2023202220232022
Change in benefit obligation:    
Benefit obligation at January 1$(103,576)$(121,166)$(6,283)$(8,480)
Service cost(397)(414)— — 
Interest cost(5,090)(2,628)(323)(233)
Benefits paid5,634 5,993 960 975 
Expenses paid247 264 — — 
Actuarial gain(807)14,375 (429)1,455 
Benefit obligation at December 31$(103,989)$(103,576)$(6,075)$(6,283)
Change in plan assets:    
Fair value of plan assets at January 1$84,058 $104,545 $— $— 
Actual return on plan assets9,279 (14,331)— — 
Expenses paid(247)(264)— — 
Contributions100 101 960 975 
Benefits paid(5,634)(5,993)(960)(975)
Fair value of plan assets at December 31$87,556 $84,058 $— $— 
Unfunded status at December 31$(16,433)$(19,518)$(6,075)$(6,283)
Amounts recognized in the consolidated balance sheets:    
Prepaid pension costs$45,292 $38,100 $— $— 
Other accrued liabilities(88)(89)(601)(596)
Non-current employee benefit liabilities(61,637)(57,529)(5,474)(5,687)
Net amounts recognized$(16,433)$(19,518)$(6,075)$(6,283)
Schedule of Net Benefit Costs
Pension BenefitsOther Postretirement Benefits
 202320222021202320222021
Service cost — benefits earned during the period$397 $414 $415 $— $— $— 
Interest cost on projected benefit obligation5,090 2,628 2,284 323 233 224 
Expected return on assets(5,038)(3,530)(3,458)— — — 
Prior service cost— — — 8 8 4 
Amortization of net loss (gain)1,055 1,636 1,835 (85)(31)86 
Net expense$1,504 $1,148 $1,076 $246 $210 $314 
Schedule of Amounts Recognized in Other Comprehensive Loss
As of December 31, 2023, accumulated other comprehensive (loss) income, before income taxes, consisted of the following:
Defined
Benefit
Pension Plans		Post-
Retirement
Plans		Total
Accumulated other comprehensive (loss) gain as of January 1, 2023$(22,667)$788 $(21,879)
Amortization of prior service costs— 8 8 
Amortization of loss (gain)1,055 (85)970 
Net (loss) gain arising during the year3,434 (429)3,005 
Accumulated other comprehensive (loss) income as of December 31, 2023$(18,178)$282 $(17,896)
As of December 31, 2022, accumulated other comprehensive (loss) income, before income taxes, consisted of the following:
Defined
Benefit
Pension Plans		Post-
Retirement
Plans		Total
Accumulated other comprehensive loss as of January 1, 2022$(20,817)$(644)$(21,461)
Amortization of prior service costs— 8 8 
Amortization of loss (gain)1,636 (31)1,605 
Net (loss) gain arising during the year(3,486)1,455 (2,031)
Accumulated other comprehensive (loss) income as of December 31, 2022$(22,667)$788 $(21,879)
Schedule of Accumulated Benefit Obligations
As of December 31, 2023, our total accumulated benefit obligations, as well as our projected benefit obligations more than the fair value of the related plan assets, for defined benefit pension plans were as follows:
December 31,
20232022
Accumulated benefit obligation$61,724 $57,618 
Fair value of plan assets$— $— 
December 31,
20232022
Projected benefit obligation$61,724 $57,618 
Fair value of plan assets$— $— 
Schedule of Assumptions Used
The assumptions used for the pension benefits and other postretirement benefits were:
 Pension BenefitsOther Postretirement Benefits
 202320222021202320222021
Weighted average assumptions:      
Discount rates — benefit obligation
4.95% - 5.35%
4.90% - 5.30%
1.80% - 2.70%
5.40%5.40%2.85%
Discount rates — service cost
4.90% - 5.30%
1.80% - 2.70%
1.40% - 2.30%
5.40%2.85%2.55%
Assumed rates of return on invested assets6.25%3.50%3.50%N/AN/AN/A
Salary increase assumptionsN/AN/AN/A3.00%3.00%3.00%
Schedule of Allocation of Plan Assets
Vector’s defined benefit retirement plan allocations by asset category, were as follows:
Plan Assets at
December 31,
 20232022
Asset category:  
Equity securities35 %34 %
Investment grade fixed income securities65 %66 %
Total100 %100 %
The defined benefit plans’ recurring financial assets subject to fair value measurements and the necessary disclosures were as follows:
 Fair Value Measurements as of December 31, 2023
Quoted Prices in
Active Markets for
Identical Assets		Significant Other
Observable Inputs		Significant
Unobservable Inputs
DescriptionTotal(Level 1)(Level 2)(Level 3)
Assets:    
Insurance contracts$1,535 $— $1,535 $— 
Amounts in individually managed investment accounts: 
Cash, mutual funds and common stock118 118 — — 
Common collective trusts at NAV (1)
85,903 — — — 
Total$87,556 $118 $1,535 $— 
(1) In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
 Fair Value Measurements as of December 31, 2022
Quoted Prices in
Active Markets for
Identical Assets		Significant Other
Observable Inputs		Significant
Unobservable Inputs
DescriptionTotal(Level 1)(Level 2)(Level 3)
Assets:    
Insurance contracts$1,679 $— $1,679 $— 
Amounts in individually managed investment accounts:    
Cash, mutual funds and common stock85 85 — — 
Common collective trusts at NAV (1)
82,294 — — — 
Total$84,058 $85 $1,679 $— 
(1) In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
Schedule of Expected Benefit Payments
Estimated future pension and postretirement medical benefits payments were as follows:
PensionPostretirement
Medical
2024$5,524 $601 
20255,177 590 
20264,860 579 
20274,539 551 
202872,548 533 
2029 - 203323,577 2,313